Updated - Symptoms of a bad injector or fuel delivery? Help! - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 05-20-2005, 11:55 AM   #11
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Well, I haven't given up, but I still haven't found the cause of the rough idle.
Last night I did the following:
1) swapped the coil packs - no change.
2) Swapped the MAF sensor - no change.
3) Plugged the vacuum hoses connected to the fuel vapor canister (because I can hear the solenoid rattling sometimes) - no change.
4) Checked the wires and plugs again - all wires look ok and measure between 4k Ohms and 7.5 KOhms. All plugs were grayish white and the electrode wear looked normal but I regapped them to .060" again anyway - no change.

Since none of the plugs look to be oild fouled, or otherwise damaged, it doesn't seem logical that one injector could cause a lean condition for all cylinders.

So it still seems as if there'* a vacuum leak somewhere or maybe it'* a fuel pump/fuel pressure regulator porblem...
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Old 05-21-2005, 12:00 AM   #12
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Filter?

Test the fuel pressure like normal and if you get good results a deadhead test might be helpful.
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Old 05-23-2005, 11:29 AM   #13
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Quote:
Originally Posted by Damemorder
Filter?

Test the fuel pressure like normal and if you get good results a deadhead test might be helpful.
The fuel filter was already replaced.

What'* a "deadhead" test?
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Old 05-24-2005, 01:05 AM   #14
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That'* where you cover the return line to see what the pump can make. I went ahead and pulled my finger off the return line at 65ish psi. My pump can make 85+psi out of the car. See what yours can do.
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Old 06-28-2005, 01:01 PM   #15
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I finally found the cause of the rough idle and fixed it.
After checking and replacing other parts with no improvement, I replaced the supercharger base gasket and tightened the vacuum block on top of the supercharger and now the engine runs like it did when I bought it.
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Old 06-29-2005, 02:18 AM   #16
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Hey, It could be a vacuum leak....
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